Battery pack mounting boundary beam and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery pack mounting boundary beam and a battery pack, the battery pack mounting boundary beam comprises at least two boundary beam parts, and each boundary beam part comprises at least two sealed buffer cavities arranged up and down. The battery pack mounting edge beam of the structure is made of the steel plate, and compared with an aluminum alloy material, the strength of the mounting edge beam can be remarkably improved; the mounting edge beam comprises at least two edge beam parts, each edge beam part comprises at least two sealed buffer cavities which are arranged up and down, the buffer cavities can play an energy absorption role when the mounting edge beam is impacted, the impact resistance and the extrusion resistance of the mounting edge beam can be improved, the mounting edge beam is mounted outside the frame body edge beam of the battery pack, and the impact resistance and the extrusion resistance of the mounting edge beam are improved. Impact force can be prevented from being transmitted into the battery pack frame body on the inner side of the mounting edge beam, so that the safety performance of the battery pack can be improved. And compared with the mode that the strength of the installation boundary beam is improved by increasing the wall thickness of an aluminum alloy plate, the material cost of the installation boundary beam made of the steel plate can be remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery pack mounting side beam and a battery pack. Background Art

[0002] A battery pack includes a box body, the box body includes a frame side beam and a mounting side beam, and the mounting side beam is welded to the outer wall surface of the frame side beam. The structural strength of the box body determines the safety performance of the battery pack. Commonly used mounting side beam structures mostly adopt the welding of aluminum alloy profiles or aluminum alloy casting, resulting in a low strength of the mounting side beam, weak anti-extrusion energy, and it is difficult to meet the requirements of new energy vehicles for the structural strength of the battery pack. If it is necessary to increase the strength of the mounting side beam, it is necessary to correspondingly increase the wall thickness of the aluminum alloy profile, but the cost of the aluminum alloy material is high, which will greatly increase the cost of the mounting side beam; at the same time, after the wall thickness of the mounting side beam made of aluminum alloy increases, the internal space of the battery pack will be compressed. Summary of the Invention

[0003] In view of this, the present invention provides a battery pack mounting side beam and a battery pack to solve the problems of insufficient strength of the mounting side beam made of aluminum alloy and high cost of the mounting side beam made of aluminum alloy.

[0004] In a first aspect, the present invention provides a battery pack mounting side beam, including:

[0005] At least two side beam parts, the adjacent ends of the adjacent side beam parts are mutually attached, each side beam part includes at least two buffer cavities arranged up and down and closed, the side wall of one end of the side beam part is a connecting wall, the height of the connecting wall is greater than or equal to the height of the side beam part at the other end, and the connecting wall is adapted to be connected to the frame side beam of the battery pack; the material of the side beam part is steel plate.

[0006] Beneficial effects: The material of the battery pack mounting side beam with this structure is steel plate, which can significantly improve the strength of the mounting side beam compared with the aluminum alloy material; and the mounting side beam includes at least two side beam parts, each side beam part includes at least two closed buffer cavities arranged up and down, and the buffer cavities can play an energy absorption effect when the mounting side beam is impacted, which can improve the anti-impact and anti-extrusion capabilities of the mounting side beam. The mounting side beam is installed outside the frame side beam of the battery pack, which can prevent the impact force from being transmitted to the battery pack frame inside the mounting side beam, thereby improving the safety performance of the battery pack. And compared with the method of increasing the strength of the mounting side beam by increasing the wall thickness of the aluminum alloy plate, the mounting side beam made of steel plate can significantly reduce the material cost.

[0007] In an optional embodiment, all the side beam parts are integrally formed by rolling.

[0008] Beneficial effects: The manufacturing process of the mounting side beam is simple, without the need to equip complex mounting side beam molds, which can effectively reduce the manufacturing cost of the mounting side beam.

[0009] In an alternative embodiment, the side beam portion includes a first side beam portion and a second side beam portion, and the connecting wall is provided at an end of the second side beam portion.

[0010] Beneficial effects: Such a setting can not only ensure the strength and anti-extrusion ability of the side beam portion, but also avoid excessive space occupation by the installed side beam, and at the same time can control the material cost of the installed side beam.

[0011] In an alternative embodiment, the connecting wall is vertically arranged, the second side beam portion is provided with an inclined wall inclined towards the connecting wall, and the inclined wall and the connecting wall enclose a top cavity, and the top cavity is arranged above the buffer cavity of the second side beam portion.

[0012] Beneficial effects: The formation of the top cavity increases the height of the connecting wall and increases the contact area between the connecting wall and the side beam of the frame. When the installed side beam is stressed, stress concentration can be avoided, and the force transmitted to the inside of the side beam of the frame can be reduced, thereby further improving the safety performance of the battery pack. The setting of the top cavity further increases the number of cavities of the second side beam portion, thereby further improving the overall anti-extrusion ability of the installed side beam.

[0013] In an alternative embodiment, both the first side beam portion and the second side beam portion are provided with two of the buffer cavities; the height of the first side beam portion is A, and the height of the connecting wall is B, B≥30mm,

[0014] Beneficial effects: B≥30mm is convenient for bending and forming the second side beam portion. The height A of the first side beam portion satisfies B≤A≤B. Such a setting can ensure that the first side beam portion has sufficient height, improve the convenience of bending and forming the first side beam portion, and facilitate the formation of the buffer cavity.

[0015] In an alternative embodiment, the cross-section of the buffer cavity is rectangular, and the height of the buffer cavity at the bottom of the first side beam portion is a,

[0016] Beneficial effects: The height of the buffer cavity at the bottom of the first side beam portion is appropriate. A section of steel plate is provided at the top of the buffer cavity, and the height of the steel plate is appropriate, so that the buffer cavities on both sides of the steel plate have appropriate heights, making the anti-extrusion abilities of the bottom and top of the first side beam portion balanced, and the anti-extrusion abilities of the bottom and top of the first side beam portion can be taken into account at the same time.

[0017] In an alternative embodiment, the heights of the two buffer cavities in the first side beam portion are the same;

[0018] And / or, the heights of the buffer cavities in the upper and lower parts of the second side beam portion are h1 and h2 respectively,

[0019]

[0020] Beneficial effects: The heights of the buffer cavities in the upper and lower parts of the second side beam portion are appropriate, and the anti-extrusion capabilities of the top and bottom of the second side beam portion can be taken into account simultaneously.

[0021] In an alternative embodiment, the total width of all the side beam portions is C, the width of the first side beam portion is C1, the width of the second side beam portion is C2, and the width between the end face of the first side beam portion away from the second side beam portion and the bottom of the inclined wall is C3.

[0022] and / or, the included angle between the inclined wall and the horizontal plane is e, 30° ≤ e ≤ 45°;

[0023] and / or, the inclined wall and the connecting wall are in arc transition to form an arc surface, and the bending radius of the arc surface is R, R ≥ 3 mm.

[0024] Beneficial effects: The bottom of the inclined wall is located in the middle of the mounting side beam or is set to be biased towards the right side of the mounting side beam. Such a setting can effectively control the material used for the inclined wall and avoid waste of materials caused by an overly long size of the inclined wall. Such a setting can ensure the space of the top cavity area and ensure the anti-extrusion effect of the mounting side beam. Such a setting can ensure that the buffer area of the first side beam portion has sufficient width and ensure the lateral anti-extrusion effect of the first side beam portion; C1 ≤ C3, which can avoid the width of the first side beam portion being too wide and compressing the width of the second side beam portion. Similarly, This can ensure that the buffer area of the second side beam portion has sufficient width and can ensure the lateral anti-extrusion effect of the second side beam portion; C2 ≤ C3, which can avoid the width of the second side beam portion being too wide and compressing the width of the first side beam portion. The widths of the first side beam portion and the second side beam portion are appropriate, and the lateral anti-extrusion effect of the mounting side beam can be ensured as a whole.

[0025] Such a setting can ensure the proportion of the top cavity in the overall height of the connecting wall and ensure that the top cavity has sufficient height for bending and forming the inclined wall.

[0026] 30° ≤ e ≤ 45°, such a setting can avoid the inclination angle of the inclined wall being too small or too large and avoid stress concentration at the bending part of the inclined wall when the mounting side beam is stressed.

[0027] In an alternative embodiment, the height of the top cavity is d.

[0028] In a second aspect, the present invention further provides a battery pack, including the battery pack mounting side beam of the above embodiment. The battery pack includes the battery pack mounting side beam, which has the same technical effects as the battery pack mounting side beam and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic perspective view of a battery pack mounting side beam according to an embodiment of the present invention;

[0031] Figure 2 For Figure 1 the cross-sectional view of the battery pack mounting side beam shown;

[0032] Figure 3 For Figure 1 the cross-sectional view of the battery pack mounting side beam shown.

[0033] Description of the reference numerals:

[0034] 1. First side beam portion; 11. First bending section; 12. Second bending section; 13. Third bending section; 14. Fourth bending section; 15. Fifth bending section; 16. Sixth bending section; 2. Second side beam portion; 21. Connecting wall; 22. Inclined wall; 23. Top cavity; 24. Arc surface; 25. Seventh bending section; 26. Eighth bending section; 27. Ninth bending section; 28. Tenth bending section; 29. Eleventh bending section; 210. Twelfth bending section; 3. Buffer cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0036] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 3 , describing the embodiments of the present invention.

[0037] According to an embodiment of the present invention, on the one hand, a battery pack mounting side beam is provided, which includes at least two side beam parts. The adjacent ends of adjacent side beam parts are attached to each other. Each side beam part includes at least two buffer cavities 3 arranged vertically and enclosed. The side wall of the side beam part at one end is a connecting wall 21, and the height of the connecting wall 21 is greater than or equal to the height of the side beam part at the other end. The connecting wall 21 is adapted to be connected to the frame side beam of the battery pack; the material of the side beam part is steel plate.

[0038] The material of the battery pack mounting side beam with this structure is steel plate, which can significantly improve the strength of the mounting side beam compared with the aluminum alloy material; and the mounting side beam includes at least two side beam parts, and each side beam part includes at least two vertically arranged enclosed buffer cavities 3. When the mounting side beam is impacted, the buffer cavities 3 can play an energy absorption effect, which can improve the anti-impact and anti-extrusion capabilities of the mounting side beam. The mounting side beam is installed outside the frame side beam of the battery pack, which can prevent the impact force from being transmitted to the battery pack frame inside the mounting side beam, thereby improving the safety performance of the battery pack. And compared with the method of increasing the wall thickness of the aluminum alloy plate to improve the strength of the mounting side beam, the mounting side beam made of steel plate can significantly reduce the material cost.

[0039] In some alternative embodiments, all side beam parts are integrally formed by rolling. The manufacturing process of the mounting side beam is simple, and there is no need to equip complex mounting side beam molds, which can effectively reduce the manufacturing cost of the mounting side beam.

[0040] As Figures 1 to 3 shown, the overlapping wall bodies of each side beam part are welded, and the overlapping wall bodies of adjacent side beam parts are welded. In this way, the structural strength of each side beam part and the whole mounting side beam can be effectively guaranteed, which is beneficial to improving the mechanical properties of the mounting side beam, thereby improving the safety performance of the battery pack.

[0041] If the mounting side beam is roll-formed from a single high-strength steel plate, when the number of side beam parts is large, the overlapping steel plate areas between the side beam parts are more, resulting in large steel plate consumption and high cost; a large number of side beam parts will also lead to a large occupied space and cannot meet the installation space requirements of the battery pack. In order to balance the mechanical properties, material cost and occupied space of the mounting side beam, in some embodiments, the side beam part includes a first side beam part 1 and a second side beam part 2, and the connecting wall 21 is arranged at the end of the second side beam part 2, that is, there are two side beam parts. Such a setting can not only ensure the strength and anti-extrusion ability of the side beam part, but also avoid excessive occupied space of the mounting side beam, and at the same time can control the material cost of the mounting side beam.

[0042] As Figures 1 to 3As shown, the connecting wall 21 is vertically arranged, and the second side beam part 2 is provided with an inclined wall 22 inclined towards the connecting wall 21. The inclined wall 22 and the connecting wall 21 enclose a top cavity 23. The top cavity 23 is arranged above the buffer cavity 3 of the second side beam part 2. The connecting wall 21 is welded to the frame side beam of the battery pack. The formation of the top cavity 23 increases the height of the connecting wall 21 and the contact area between the connecting wall 21 and the frame side beam. When the installation side beam is stressed, stress concentration can be avoided, and the force transmitted to the inside of the frame side beam can be reduced, thereby further improving the safety performance of the battery pack. The setting of the top cavity 23 further increases the number of cavities of the second side beam part 2, thereby further improving the overall anti-extrusion ability of the installation side beam.

[0043] In other embodiments, more than three side beam parts may be provided, and a plurality of side beam parts are arranged in sequence along the direction of the installation side beam.

[0044] In some embodiments, as Figures 1 to 3 shown, both the first side beam part 1 and the second side beam part 2 are provided with two buffer cavities 3; the height of the first side beam part 1 is A, and the height of the connecting wall 21 is B, B≥30mm, Both the first side beam part 1 and the second side beam part 2 are provided with two buffer cavities 3, which facilitates directly roll-forming two side beam parts through a single steel plate, reducing the overlapping area of the steel plate, and reducing consumables and costs. There are three cavities in the height direction of the connecting wall 21. If the height of the connecting wall 21 is too small, it is not convenient to roll-form the second side beam part 2. Therefore, the height B of the connecting wall 21 is made B≥30mm to facilitate the bending and forming of the second side beam part 2. Similarly, if the height of the first side beam part 1 is too small, it is inconvenient to bend the first side beam part 1. Therefore, the height A of the first side beam part 1 satisfies This setting can ensure that the first side beam part 1 has sufficient height, improve the convenience of bending and forming the first side beam part 1, and facilitate the formation of the buffer cavity 3.

[0045] Optionally, in some embodiments,

[0046] In some embodiments, as Figures 1 to 3 shown, the cross-section of the buffer cavity 3 is rectangular, and the height of the buffer cavity 3 at the bottom of the first side beam part 1 is a, The height of the buffer cavity 3 at the bottom of the first side beam part 1 is appropriate. There is a section of steel plate at the top of the buffer cavity 3, and the height of the steel plate is appropriate, which can make the buffer cavities 3 on both sides of the steel plate have appropriate heights, making the anti-extrusion abilities of the bottom and top of the first side beam part 1 balanced, and taking into account the anti-extrusion abilities of both the bottom and top of the first side beam part 1.

[0047] In some alternative embodiments, as Figure 3 shown, the heights of the two buffer cavities 3 in the first side beam part 1 are the same, The heights of the two buffer cavities 3 inside the first side beam portion 1 are the same, which can take into account the anti-extrusion capabilities of both the top and bottom of the first side beam portion 1 simultaneously.

[0048] In some embodiments, as Figure 3 shown, the heights of the buffer cavities 3 in the upper and lower parts of the second side beam portion 2 are h1 and h2 respectively, The heights of the buffer cavities 3 in the upper and lower parts of the second side beam portion 2 are appropriate, which can take into account the anti-extrusion capabilities of both the top and bottom of the second side beam portion 2 simultaneously.

[0049] Optionally, in some implementations, the heights of the buffer cavities 3 in the upper and lower parts of the second side beam portion 2 are the same, i.e., h1 = h2. In some embodiments, h1 = h2 = a.

[0050] As Figure 3 shown, in some embodiments, the total width of all side beam portions is C, the width of the first side beam portion 1 is C1, the width of the second side beam portion 2 is C2, and the width between the end face of the first side beam portion 1 away from the second side beam portion 2 and the bottom of the inclined wall 22 is C3. That is, the bottom of the inclined wall 22 is located in the middle of the installation side beam or is set to be biased towards the right side of the installation side beam. Such a setting can effectively control the material used for the inclined wall 22 and avoid waste of materials due to an overly long size of the inclined wall 22. Such a setting can ensure the space in the top cavity 23 area and ensure the anti-extrusion effect of the installation side beam. Such a setting can ensure that the buffer area of the first side beam portion 1 has sufficient width and ensure the lateral anti-extrusion effect of the first side beam portion 1; C1 ≤ C3, which can avoid the width of the first side beam portion 1 being too wide and compressing the width of the second side beam portion 2. Similarly, This can ensure that the buffer area of the second side beam portion 2 has sufficient width and can ensure the lateral anti-extrusion effect of the second side beam portion 2; C2 ≤ C3, which can avoid the width of the second side beam portion 2 being too wide and compressing the width of the first side beam portion 1. The widths of the first side beam portion 1 and the second side beam portion 2 are appropriate, which can overall ensure the lateral anti-extrusion effect of the installation side beam.

[0051] In some alternative embodiments,

[0052] As Figure 3 shown, in some embodiments, the height of the top cavity 23 is d. Such a setting can ensure the proportion of the top cavity 23 in the overall height of the connecting wall 21 and ensure that the top cavity 23 has sufficient height for bending and forming the inclined wall 22.

[0053] In some embodiments, the angle between the inclined wall 22 and the horizontal plane is e, where 30° ≤ e ≤ 45°. Such a setting can prevent the inclination angle of the inclined wall 22 from being too small or too large, and avoid stress concentration at the bending position of the inclined wall 22 when the mounting side beam is stressed.

[0054] The inclined wall 22 and the connecting wall 21 are in arc transition to form an arc surface 24, and the bending radius of the arc surface 24 is R, where R ≥ 3 mm. Such a setting can avoid stress concentration caused by too small a bending radius.

[0055] As Figure 2 and Figure 3 shown, the first side beam portion 1 includes a first bending section 11, a second bending section 12, a third bending section 13, a fourth bending section 14, a fifth bending section 15, and a sixth bending section 16 that are connected in sequence. Among them, the first bending section 11 extends vertically upward, the second bending section 12 extends horizontally, the third bending section 13 extends vertically downward, the fourth bending section 14 extends horizontally, the fifth bending section 15 extends vertically upward, the sixth bending section 16 extends horizontally, and the sixth bending section 16 is connected to the inclined wall 22. One end of the seventh bending section 25 is connected to the bottom of the connecting wall 21, the seventh bending section 25 extends horizontally away from the connecting wall 21, the eighth bending section 26 extends vertically upward, the ninth bending section 27 extends horizontally toward the connecting wall 21, the tenth bending section 28 extends vertically downward, the eleventh bending section 29 extends horizontally away from the connecting wall 21, and the twelfth bending section 210 extends vertically downward. The first bending section 11 fits against the inner wall surface of the fifth bending section 15, and the length of the overlapping area between the two is L1; the tenth bending section 28 fits against the inner wall surface of the connecting wall 21, and the overlapping length between the two is L2; the third bending section 13 fits against the outer wall surface of the eighth bending section 26, the twelfth bending section 210 fits against the inner wall surface of the eighth bending section 26, and the length of the overlapping area between the third bending section 13 and the eighth bending section 26, and between the twelfth bending section 210 and the eighth bending section 26 is L3. The overlapping areas of each section are welded, and L1, L2, and L3 are all greater than or equal to 3 mm. This can ensure the welding length and welding area of the overlapping area of the mounting side beam, and ensure the overall strength of the mounting side beam.

[0056] According to an embodiment of the present invention, on the other hand, a battery pack is provided, which includes the above-mentioned battery pack mounting side beam and the frame side beam, and the mounting side beam is welded outside the frame side beam.

[0057] For the battery pack with this structure, the material of the installation side beam is steel plate, which can significantly improve the strength of the installation side beam compared with the aluminum alloy material; and the installation side beam includes at least two side beam parts, and each side beam part includes at least two closed buffer cavities 3 arranged up and down. When the installation side beam is impacted, the buffer cavities 3 can play an energy absorption effect, improve the impact resistance and extrusion resistance of the installation side beam, and prevent the impact force from being transmitted to the battery pack frame inside the installation side beam, thereby improving the safety performance of the battery pack. And compared with the method of increasing the wall thickness of the aluminum alloy plate to improve the strength of the installation side beam, the installation side beam made of steel plate can significantly reduce the material cost.

[0058] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery pack mounting side beam, characterized in that: include: At least two side beam parts, adjacent ends of adjacent side beam parts are arranged in contact with each other, each side beam part includes at least two buffer cavities arranged up and down and closed, the side wall of the side beam part at one end is a connecting wall, the height of the connecting wall is greater than or equal to the height of the side beam part at the other end, and the connecting wall is suitable for connecting with the frame side beam of the battery pack; the material of the side beam part is steel plate.

2. The battery pack mounting side beam according to claim 1, characterized in that: All the side beam parts are integrally formed by rolling.

3. The battery pack mounting side beam according to claim 2, characterized in that: The side beam portion includes a first side beam portion and a second side beam portion, and the connecting wall is arranged at an end portion of the second side beam portion.

4. The battery pack mounting side beam according to claim 3, characterized in that: The connecting wall is vertically arranged, and the second side beam portion is provided with an inclined wall inclined toward the connecting wall. The inclined wall and the connecting wall enclose a top cavity, and the top cavity is arranged at the upper part of the buffer cavity of the second side beam portion.

5. The battery pack mounting side beam according to claim 4, characterized in that: The first side beam portion and the second side beam portion are each provided with two buffer cavities; the height of the first side beam portion is A, the height of the connecting wall is B, B ≥ 30 mm, 6. The battery pack mounting side beam according to claim 5, characterized in that: The cross section of the buffer cavity is rectangular, and the height of the buffer cavity at the bottom of the first side beam portion is a.

7. The battery pack mounting side beam according to claim 6, characterized in that: The two buffer cavities in the first side beam portion have the same height; and / or, the heights of the buffer cavity at the upper part and the lower part of the second side beam portion are h1 and h2 respectively, 8. The battery pack mounting side beam according to any one of claims 4 to 7, characterized in that: The total width of all the side beams is C, the width of the first side beam is C1, the width of the second side beam is C2, and the width between the end surface of the first side beam away from the second side beam and the bottom of the inclined wall is C3. and / or, the angle between the inclined wall and the horizontal plane is e, 30°≤e≤45°; And / or, the inclined wall and the connecting wall are transitioned into an arc to form an arc surface, and the bending radius of the arc surface is R, R≥3mm.

9. The battery pack mounting side beam according to any one of claims 5 to 7, characterized in that: The height of the top cavity is d, 10. A battery pack, characterized in that: A battery pack mounting side beam comprising the battery pack mounting side beam as described in any one of claims 1 to 9.

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